#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PREFIX="${HOME}/.local"
LIBDIR="${PREFIX}/lib/tui"
BINDIR="${PREFIX}/bin"
BASHRC="${HOME}/.bashrc"
MARKER="# >>> tui shell integration >>>"
ENDMARKER="# <<< tui shell integration <<<"

if ! command -v python3 >/dev/null 2>&1; then
    echo "install.sh: python3 is required" >&2
    exit 1
fi

if ! python3 - <<'PY'
try:
    import yaml
except ImportError:
    raise SystemExit(1)
PY
then
    echo "install.sh: PyYAML is required." >&2
    echo "Install it with: sudo apt install python3-yaml" >&2
    exit 1
fi

mkdir -p "$LIBDIR" "$BINDIR"
install -m 755 "$SCRIPT_DIR/tui/tui.py" "$LIBDIR/tui.py"
install -m 644 "$SCRIPT_DIR/tui/tui-shell.bash" "$LIBDIR/tui-shell.bash"

# Optional standalone entry point. The normal command is the Bash function
# loaded from tui-shell.bash; this wrapper is useful for diagnostics.
cat > "$BINDIR/tui.py" <<EOF2
#!/usr/bin/env bash
exec python3 "$LIBDIR/tui.py" "\$@"
EOF2
chmod 755 "$BINDIR/tui.py"

# Load the Bash integration for every interactive Bash session. On Debian,
# the normal login startup path loads ~/.bashrc for interactive Bash shells.
touch "$BASHRC"
if ! grep -Fqx "$MARKER" "$BASHRC"; then
    {
        printf '\n%s\n' "$MARKER"
        printf 'source "%s"\n' "$LIBDIR/tui-shell.bash"
        printf '%s\n' "$ENDMARKER"
    } >> "$BASHRC"
fi

# Install an example configuration only if the user does not already have
# one in the current directory. .tui files are deliberately project-local.
if [[ ! -e "$HOME/.tui" && -f "$SCRIPT_DIR/tui/example.tui" ]]; then
    cp "$SCRIPT_DIR/tui/example.tui" "$HOME/.tui"
    echo "Installed example configuration: ~/.tui"
fi

printf '\nTUI installed to %s\n' "$LIBDIR"
printf 'Bash integration installed in %s\n' "$BASHRC"
printf '\nStart a new login/terminal session, or run:\n  source ~/.bashrc\n\nThen:\n  tui\n'